Siemens CP 243-2 Operations Instructions download pdf (Page 25)

What to do if something

goes wrong

Errors can occur even in the best sys-

tems. In AS-Interface too, there are error

patterns that are usually easy to detect

and just as easy to eliminate. The only

error that AS-Interface cannot recognise

is the failure of a binary sensor or actu-

ator integrated in a module.

A defective slave can simply be re-

placed by a new slave. An AS-Interface

cable break will of course result in the

failure of slaves. By locating their posi-

tion it is possible to find the cable break

because the slaves located beyond the

interruption point from the point of view

of the master can then no longer be ad-

dressed.

A short circuit can have a disastrous ef-

fect on the system. The master there-

fore recognises a short circuit by the

APF bit (AS-Interface Power Fail) and

immediately takes action. All slaves im-

mediately go into the status “not ac-

tive”. For the actuators that means that

power stops flowing.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 47 48

No comments

Siemens CP 243-2 Operations Instructions Page 25